Reduce boilerplate when creating simple mojom::URLLoaders.

media/remoting/demuxer_stream_adapter.cc

Index: media/remoting/demuxer_stream_adapter.cc
diff --git a/media/remoting/demuxer_stream_adapter.cc b/media/remoting/demuxer_stream_adapter.cc
index de8bfd0024d5ced496a58e89da63e9be02d792c5..23ec4f231c2f32c53c9ba72fea1b591666080b8a 100644
--- a/media/remoting/demuxer_stream_adapter.cc
+++ b/media/remoting/demuxer_stream_adapter.cc
@@ -23,13 +23,7 @@ namespace remoting {
 mojo::DataPipe* DemuxerStreamAdapter::CreateDataPipe() {
   // Capacity in bytes for Mojo data pipe.
   constexpr int kMojoDataPipeCapacityInBytes = 512 * 1024;
-
-  MojoCreateDataPipeOptions options;
-  options.struct_size = sizeof(MojoCreateDataPipeOptions);
-  options.flags = MOJO_WRITE_DATA_FLAG_NONE;
-  options.element_num_bytes = 1;
-  options.capacity_num_bytes = kMojoDataPipeCapacityInBytes;
-  return new mojo::DataPipe(options);
+  return new mojo::DataPipe(kMojoDataPipeCapacityInBytes);
 }
 
 DemuxerStreamAdapter::DemuxerStreamAdapter(